Excellent fares from Auckland to multiple European destinations on a combination of Etihad Airways and Air New Zealand (some Etihad flights are operated by Air NZ). Note that even cheaper deals may be available with occasional Jetstar etc flights, which will show up in the search results for you to choose.
Also see Business Class to Milan from $5971 return and London from $7728 Return
Summary:
Auckland - Athens return (2 May 26 - 13 Jun 26) from $1707 return
Auckland - Barcelona return (2 May 26 - 12 Jun 26) from $1770 return
Auckland - Dublin return (2 May 26 - 8 Jun 26) from $1653 return
Auckland - London return (2 May 26 - 12 Jun 26) from $2066 return
Auckland - Madrid return (2 May 26 - 16 Jun 26) from $2144 return
Auckland - Milan return (4 May 26 - 16 Jun 26) from $1786 return
Auckland - Rome return (2 May 26 - 23 Jun 26) from $2450 return
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Also consider having a look at the current best found deals by city - Auckland, Christchurch, Dunedin, Hamilton, Queenstown, Wellington.
That's pretty good deal - saw someone on tiktok buy a ticket to London a week ago for about $1100 one way with Etihad via Abu Dhabi for travel end of May